18:37:43 (573.52 KB/s) - `/usr/portage/distfiles/gruff-0.1.2.gem' s * checking ebuild checksums ;-) ... * checking auxfile checksums ;-) ... * checking miscfile checksums ;-) ... * checking gruff-0.1.2.gem ;-) ... >>> Unpacking source... >>> Source unpacked. >>> Compiling source in /var/tmp/portage/gruff-0.1.2/work ... >>> Source compiled. >>> Test phase [not enabled]: dev-ruby/gruff-0.1.2 >>> Install gruff-0.1.2 into /var/tmp/portage/gruff-0.1.2/image/ ca ERROR: While executing gem ... (OptionParser::InvalidOption) invalid option: --no-ri works with doc and example useflags
This appears to be the same issue as reported in #155513 This should be fixed after an emerge --sync.